SQL 2012 HADR failover instance

Question

Greetings all.
Currently here is the setup we have built out.  All are Server 2012 R2 OS
2 node FCI shared storage SQL 2012 servers in production site.  Failover works flawlessly between them. WSFC setup between them
1 node in DR, member of the WSFC with the 2 servers above but not FCI, seperate storage infrastructure but same disk drive letter setups
Availability Groups setup between the 2 that are fully synchronized
We are going to have a planned primary outage in the primary DC.  Nerves are getting the better of me in regard to the setup.  I know the data is there and it can be accessed.  My question is that once i perform the failure of the two nodes
in the FCI how are my applications going to know how to reach the HADR server as it is on a seperate instance?  Does SQL aliasing need to be setup in the configuration to make it work properly or am i being overly paranoid at this point?

Answer 1

The listener name is similar to a cluster client access point. When you create a listener name, it will create a virtual computer object in Active Directory and, with AD-integrated DNS, will create the corresponding DNS entries. Depending on how you configure
your cluster, the listener name should have 2 virtual IP addresses - one for the production network and another for the DR network - and will be written to the DNS. That being said, your listener name has to be unique so that the network traffic can be properly
routed to the instance running the Availability Group. You also need to configure the appropriate TTL value for the listener name or use the latest SQL Server client APIs to take advantage of the MultiSubnetFailover parameter in the application connection
string
Edwin Sarmiento SQL Server MVP | Microsoft Certified Master
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